To repay a kindness received, often unexpectedly and with extraordinary assistance, much like the legend of Wei Ke who was aided by the spirit of a person whose life he had saved.
他当年受人提携，心中一直感念不已，希望有朝一日能魏颗结草，回报这份恩情
He was once helped by someone, and he has always been deeply grateful, hoping that one day he can repay that kindness in a significant way, just like Wei Ke tying grass.
Era:
Ancient
Frequency:
Synonym:
Story:
During the Spring and Autumn period, Wei Ke, a high official of the Jin state, disregarded his father's incoherent dying wish that his concubine be buried with him. Instead, Wei Ke arranged for the concubine to remarry.
Later, when Wei Ke was fighting against General Du Hui of the Qin state, the concubine's father's spirit appeared on the battlefield, tying grass knots to trip General Du Hui, helping Wei Ke capture him. This act was considered a repayment for Wei Ke's kindness in saving his daughter's life.
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